I still have more testing to do and I need to compare libraries still, but 40 seconds into Fleetwood Mac - The Chain (2001 Remaster) on Tidal Master or Qobuz 24bit/96Khz quality and I can tell already. Actually I knew the first 15 seconds based on what I was hearing in the background... It's immediately apparent that Qobuz has higher quality here.
Obviously the files each streaming service receives are so subjective. It may just be in terms of "who got the better copy" and in this case Qobuz hands down.
The detail in the strings and the background noise alone are just enough indication. I didn't even need to play the whole song out to make up my mind (though I will of course continue to listen to more material). I was honestly shocked to be able to see that kinda difference immediately. I'm not convinced it's with the streaming quality, it could simply be that Qobuz has a better source file, but wow.
Also, Deezer (2004 Remaster btw, different track) doesn't fall far behind at all. It's at 16-Bit/44.1 kHz compared to 24-Bit/96Khz. You can hear the difference, but I still think it's pretty good quality. Though Qobuz is cheaper than Deezer.
Edit: Next song. Guns N' Roses - Paradise City 24-Bit/192Khz on Qobuz (for which Qobuz does not have many at 192Khz btw, you can search with the search term: 192).
Ok. Hold the phone. WHAT?! This just blew my mind. The sound stage and detail is OFF THE CHAIN. Now, to be fair, Tidal's Master doesn't fall too far behind, but ... well it kinda does. The difference here is a much larger gap than apples to apples 24bit/96Khz between the services. I guess it should be. The question is, does it really matter? Can we really tell the difference between 192Khz and 96Khz? Um, yea. I believe so. Again, could be the source file too, but this is pretty awesome. I'm very sad that I don't see November Rain at 192Khz (there's an acoustic and piano version, but no original?? I mean if the Super Deluxe didn't include it, it didn't include it, nothing Qobuz can do...but I wonder why). But there's a darn good chunk of Guns N' Roses here at ridiculous quality.